21202112099957 has 2 divisors, whose sum is σ = 21202112099958. Its totient is φ = 21202112099956.

The previous prime is 21202112099899. The next prime is 21202112100067. The reversal of 21202112099957 is 75999021120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19676020006756 + 1526092093201 = 4435766^2 + 1235351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202112099957 - 2⁶ = 21202112099893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202112099057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601056049978 + 10601056049979.

It is an arithmetic number, because the mean of its divisors is an integer number (10601056049979).

Almost surely, 2^{21202112099957} is an apocalyptic number.

It is an amenable number.

21202112099957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202112099957 is an equidigital number, since it uses as much as digits as its factorization.

21202112099957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 21202112099957 in words is "twenty-one trillion, two hundred two billion, one hundred twelve million, ninety-nine thousand, nine hundred fifty-seven".